[comments from jerry@samba.org: 100% reproducible]
But the blue screen still appears everytime I connect
to this machine ("fatal exception at 0028:C0004D3F in
VXD VMM(01)+00003D3F ...").
It also happens only if the authentication is
succesfull.
This problem disappears if win98 is switched back to
share-level access control.
I've attached a level 10 debug log of smbd. It covers
the time beginning at the execution of `smbclient -L
win98mach -Uuser%pass` until the blue-screen appears.